High‐Performance Low‐ <i>k</i> Poly(dicyclopentadiene) Nanocomposites as Achieved via Reactive Blending with Norbornene‐Functionalized Larger POSS

Low dielectric constant (k) polymers with excellent comprehensive properties are useful materials in the microelectronics industry as matrix resins or encapsulation layers. With inherent low polarization, high reactivity, good processability, and cost, poly(dicyclopentadiene) (PDCPD) has received considerable attention low-k materials. However, its practical application is limited by relatively thermal expansion k value. Herein, three norbornene-functionalized polyhedral oligomeric silsesquioxanes (POSSs) T8, T10, T12 cores synthesized employed for enhancing of PDCPD via reactive blending. The results show that these POSSs have compatibility nano-dispersed particles could be obtained. As a result, materials’ can largely enhanced varying POSS content size. Especially, PT12N12-40 (40 wt% T12N12) shows lowest value (2.1) coefficient (63.4 ppm°C−1), highest glass transition temperature (202.5 °C), yield strength (78.0 MPa), elastic modulus (2.36 GPa), along hydrophobicity. This study highlights strategy to fabricate high-performance polymer nanocomposites using larger blending, which provides future microelectronic frequency communication.